definitely:
  * more completers
    * git, pass, ssh/mosh would be useful for me; it might be a good idea to sweep through bash completions and port many over
    * mechanism for easily adding more completers
  * plugin infrastructure and/or event hooks
  * job-controllable procproxies
  * fix https://github.com/xonsh/xonsh/issues/1921
  * 3.6 support (inc. https://github.com/xonsh/xonsh/issues/1887)

maybe:
  * different frontend (probably via pyrepl)
  * compile tako to python or .pyc (make sharing easier?)
  * paste-jacking protection (available in readline 7, see https://github.com/xonsh/xonsh/issues/1154)
  * implement https://github.com/xonsh/xonsh/pull/1862
  * 3.3 support (for pypy)
